U.S. patent application number 14/132488 was filed with the patent office on 2014-12-25 for wireless communication device.
This patent application is currently assigned to FIH (HONG KONG) LIMITED. The applicant listed for this patent is FIH (Hong Kong) Limited. Invention is credited to CHAO-WEI HO, CHENG-HUNG KO.
Application Number | 20140375506 14/132488 |
Document ID | / |
Family ID | 52110449 |
Filed Date | 2014-12-25 |
United States Patent
Application |
20140375506 |
Kind Code |
A1 |
KO; CHENG-HUNG ; et
al. |
December 25, 2014 |
WIRELESS COMMUNICATION DEVICE
Abstract
A wireless communication device includes a base board, an
antenna, a metal assembly, and a conductive assembly. The base
board includes a feed portion and a ground portion, and defines a
keep-out-zone. The antenna is located above the keep-out-zone, and
is electronically connected to the feed portion and the ground
portion. The metal assembly is located at the keep-out-zone, and is
spaced from the antenna. The metal assembly is electronically
connected to the feed portion and the ground portion through the
conductive assembly.
Inventors: |
KO; CHENG-HUNG; (Shindian,
TW) ; HO; CHAO-WEI; (New Taipei, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
FIH (Hong Kong) Limited |
Kowloon |
|
HK |
|
|
Assignee: |
FIH (HONG KONG) LIMITED
Kowloon
HK
|
Family ID: |
52110449 |
Appl. No.: |
14/132488 |
Filed: |
December 18, 2013 |
Current U.S.
Class: |
343/700MS |
Current CPC
Class: |
H01Q 9/0421 20130101;
H01Q 5/371 20150115; H01Q 1/245 20130101; H01Q 1/243 20130101 |
Class at
Publication: |
343/700MS |
International
Class: |
H01Q 1/38 20060101
H01Q001/38 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 24, 2013 |
TW |
102122425 |
Claims
1. A wireless communication device, comprising: a base board having
a feed portion and a ground portion, a keep-out-zone defined at a
side of the base board; an antenna located above the keep-out-zone,
and electronically connected to the feed portion and the ground
portion; a metal assembly located at the keep-out-zone, and spaced
from the antenna; and a conductive assembly; wherein the metal
assembly is electronically connected to the feed portion and the
ground portion through the conductive assembly.
2. The wireless communication device as claimed in claim 1, wherein
the metal assembly comprises a first metal sheet and a second metal
sheet, the first metal sheet and the second metal sheet are
interconnected via the conductive assembly.
3. The wireless communication device as claimed in claim 2, wherein
the conductive assembly comprises a first inductor, a second
inductor, and a third inductor, the first inductor is connected
between the feed portion and the first metal sheet, the second
inductor is connected between the second metal sheet and the ground
portion, the third inductor is connected between the first metal
sheet and the second metal sheet.
4. The wireless communication device as claimed in claim 3, wherein
the feed portion is a circular shaped metal sheet, the antenna is
connected to a center of the feed portion.
5. The wireless communication device as claimed in claim 4, wherein
the first inductor is connected to a peripheral edge of the feed
portion.
6. The wireless communication device as claimed in claim 1, wherein
the antenna comprises a feed end and a ground end, the feed end is
electronically connected to the feed portion, and the ground end is
electronically connected to the ground portion.
7. The wireless communication device as claimed in claim 6, wherein
the antenna further comprises a connection body, a first radiator,
and a second radiator, the connection body is a rectangular sheet,
and is perpendicularly connected to a distal end of the feed end,
both of the first radiator and the second radiator are connected to
the connection body, and the second radiator is perpendicularly
connected to the ground end.
8. A wireless communication device, comprising: a base board having
a feed portion for providing current; an antenna located above the
base board, and electronically connected to the feed portion to
receive the current; a metal assembly spaced from the antenna; and
a conductive assembly electronically connected to the feed portion
and the metal assembly; wherein the conductive assembly obtains a
proportion of the current from the feed portion, and the metal
assembly absorbs the proportion of the current.
9. The wireless communication device as claimed in claim 8, wherein
the base board defines a keep-out-zone, the antenna is located
above the keep-out-zone, and the metal assembly located at the
keep-out-zone.
10. The wireless communication device as claimed in claim 8,
wherein the metal assembly comprises a first metal sheet and a
second metal sheet, the first metal sheet and the second metal
sheet are interconnected via the conductive assembly.
11. The wireless communication device as claimed in claim 10,
wherein the conductive assembly comprises a first inductor, a
second inductor, and a third inductor, the first inductor is
connected between the feed portion and the first metal sheet, the
second inductor is connected between the second metal sheet and a
ground portion of the base board, the third inductor is connected
between the first metal sheet and the second metal sheet.
12. The wireless communication device as claimed in claim 11,
wherein the feed portion is a metal sheet with circular shape, the
antenna is connected to a center of the feed portion.
13. The wireless communication device as claimed in claim 12,
wherein the first inductor is connected to a peripheral edge of the
feed portion.
Description
BACKGROUND
[0001] 1. Technical Field
[0002] The present disclosure relates to a wireless communication
device employing an antenna.
[0003] 2. Description of Related Art
[0004] A dual-band antenna is commonly a planar antenna, which
includes a first radiating portion for transmitting/receiving
wireless signals at high frequencies and a second radiating portion
for transmitting/receiving wireless signals at low frequencies The
first and second radiating portions are usually connected to a feed
end of the dual-band antenna. During testing of specific absorption
rate (SAR) of the dual-band antenna, current from the feed end may
be added together. Since the SAR mainly depends on the current
intensity of the antenna, thus SAR at the feed end becomes too
high, which may negatively influence users.
[0005] Therefore, there is room for improvement within the art.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Many aspects of the disclosure can be better understood with
reference to the drawings. The components in the drawings are not
necessarily drawn to scale, the emphasis instead being placed upon
clearly illustrating the principles of the disclosure. Moreover, in
the drawings, like reference numerals designate corresponding parts
throughout the views.
[0007] The FIGURE is an isometric view of a wireless communication
device, according to an exemplary embodiment.
DETAILED DESCRIPTION
[0008] The disclosure is illustrated by way of example and not by
way of limitation in the figures of the accompanying drawings in
which like references indicate similar elements. It should be noted
that references to "an" or "one" embodiment in this disclosure are
not necessarily to the same embodiment, and such references mean
"at least one."
[0009] The FIGURE shows a wireless communication device 100
according to an exemplary embodiment. The wireless communication
device 100 may be a mobile phone or a personal digital assistant,
for example.
[0010] The wireless communication device 100 includes a base board
10, an antenna 20, a metal assembly 30, and a conductive assembly
40. The antenna 20 is located above the base board 10, the metal
assembly 30 and the conductive assembly 40 are positioned at a side
of the base board 10.
[0011] The base board 10 is a printed circuit board (PCB) of the
wireless communication device 100, and is made of composite
materials. A feed portion 11 and a ground portion 12 are
electrically mounted on the base board 10. The feed portion 11
provides current to the antenna 20, and the antenna 20 is grounded
by the ground portion 12. In one exemplary embodiment, the feed
portion 11 is a circular shaped metal sheet, current on a center of
the feed portion 11 is greater than current on other positions of
the feed portion 11.
[0012] A keep-out-zone S is defined at a side of the base board 10.
The purpose of keep-out-zone S is to not permit other elements
(such as a camera, a vibrator, a speaker, etc.) on the base board
10 to be placed in a predetermined area where it may interfere with
the antenna. In one exemplary embodiment, The antenna 20 is located
above the keep-out-zone S, the metal assembly 30 and the conductive
assembly 40 are positioned at the keep-out-zone S.
[0013] In one exemplary embodiment, the antenna 20 is a planar
inverted-F antenna (PIFA), and includes a feed end 21, a ground end
22, a connection body 23, a first radiator 24, and a second
radiator 25. The feed end 21 is electronically connected to the
center of the feed portion 11. The connection body 23 is a
rectangular sheet, and is perpendicularly connected to a distal end
of the feed end 21. Both of the first radiator 24 and the second
radiator 25 are connected to the connection body 23, and a gap (not
shown) is defined between the first radiator 24 and the second
radiator 25. The ground end 22 is electronically connected to the
ground portion 12, and the second radiator 25 is perpendicularly
connected to the ground end 22. In one exemplary embodiment, the
antenna 20 can receive/transmit wireless signals having the central
frequency of about 1852 MHz, 1880 MHz, and 1908 MHz.
[0014] Since the feed end 21 is electronically connected to the
center of the feed portion 11, current from the feed portion 11 is
gathered around the feed end 21. For example, the current from the
feed portion 11 is gathered at the feed end 21 and the connection
body 23.
[0015] The metal assembly 30 includes a plurality of metal sheets.
In one exemplary embodiment, the metal assembly 30 includes a first
metal sheet 31 and a second metal sheet 32. The first metal sheet
31 and the second metal sheet 32 are located at the keep-out-zone
S, and are spaced from the first radiator 24 and the second
radiator 25.
[0016] The conductive assembly 40 is connected between the base
board 10 and the metal assembly 30. In one exemplary embodiment,
the conductive assembly 40 includes a first inductor L1, a second
inductor L2, and a third inductor L3. The first inductor L1 is
connected between a peripheral edge of the feed portion 11 and the
first metal sheet 31.
[0017] The second inductor L2 is connected between the second metal
sheet 32 and the ground portion 12. The third inductor L3 is
connected between the first metal sheet 31 and the second metal
sheet 32.
[0018] Referring to the table 1, when the metal assembly 30 and the
conductive assembly 40 are incorporated into the wireless
communication device 100, the specific absorption rate (SAR) of the
antenna 20 is significantly reduced. For example, when the antenna
20 receives/transmits wireless signals having the central frequency
of about 1852 MHz, the SAR of the wireless communication device 100
is reduced about 0.19 (1.14-0.95=0.19).
[0019] The table 1 sets out a relation among frequencies, SAR of
the wireless communication device 100 having the metal assembly 30
and the conductive assembly 40, and SAR of the wireless
communication device 100 lacking the metal assembly 30 and the
conductive assembly 40:
TABLE-US-00001 SAR of the wireless SAR of the wireless
communication device 100 communication device 100 lacking the metal
assembly having the metal assembly Frequencies 30 and the
conductive 30 and the conductive Signal (MHz) assembly 40 (1 g)
assembly 40 (1 g) WCDMA 1852 1.14 0.95 BAND 2 1880 1.42 1.06 1908
1.85 1.37
[0020] The table 2 shows that when the metal assembly 30 and the
conductive assembly 40 are incorporated into the wireless
communication device 100, the insertion loss efficiency of the
antenna 20 is significantly reduced, and the radiation efficiency
of the wireless communication device 100 is greater than 20
percent, thereby satisfying communication standards.
[0021] Table 2 sets out a relation among frequencies, an insertion
loss efficiency of the antenna 20, and a radiation efficiency of
the wireless communication device 100:
TABLE-US-00002 Insertion Radiation Radiation loss efficiency of
efficiency efficiency the wireless Frequencies Wireless of the of
the communication Signal (MHz) communication device antenna antenna
device WCDMA 1852 Lacking the metal 31.30% 81.50% 25.30% BAND 2
assembly 30 and the conductive assembly 40 Having the metal 28.70%
75.50% 21.70% assembly 30 and the conductive assembly 40 1880
Lacking the metal 31.60% 87.10% 27.50% assembly 30 and the
conductive assembly 40 Having the metal 29.10% 81.00% 23.60%
assembly 30 and the conductive assembly 40 1908 Lacking the metal
31.70% 92.60% 29.00% assembly 30 and the conductive assembly 40
Having the metal 29.30% 89.20% 26.00% assembly 30 and the
conductive assembly 40
[0022] Since the metal assembly 30 is located at the keep-out-zone
S, and is electronically connected to the base board 10 through the
conductive assembly 40, a proportion of the current can be absorbed
by the metal assembly 30, thereby reducing the current intensity on
the feed end 21 of the antenna 20 and changing distributions of the
current on the antenna 20. Thus, the SAR of the antenna 20 is
significantly reduced. Additionally, the first inductor L1 is
connected to the peripheral edge of the feed portion 11 to obtain
small current, thus, the radiation efficiency of the wireless
communication device 100 will not be negatively influenced.
[0023] In other exemplary embodiments, the conductive assembly 40
can be a plurality of capacitors.
[0024] In summary, the conductive assembly 40 obtains a proportion
of the current from the base board 10, and the metal assembly 30
absorbs the proportion of the current. Thus, the current flowing to
the antenna 20 is reduced, and the antenna 20 has a dispersed and
even electromagnetic radiation field and obtains a reduced SAR.
[0025] It is to be understood, however, that even through numerous
characteristics and advantages of the present disclosure have been
set forth in the foregoing description, together with details of
assembly and function, the disclosure is illustrative only, and
changes may be made in detail, especially in the matters of shape,
size, and arrangement of parts within the principles of the
disclosure to the full extent indicated by the broad general
meaning of the terms in which the appended claims are
expressed.
* * * * *